Man and hand hole connection for boilers.



No, 853,821. 'PATENTED MAY 14, 1907.

I J. A. MoOORMIGK. MAN AND HAND HOLE CONNECTION FOR BOILERS.

APPLICATION FILED NOV. 3, 1906.

mum-ma.

- Nauseapermits come t UNITED STATES PATENT; OFFICE- JUN'IUS A. MoCOR'MICK, or PITTSBURG, PENNSYLVANIA.

MAN AND HAND HOLE" CONNECTION FORBOILERS.

which will prevent leakage when the pressure in the boiler drops. a

The usual means employed for closing handholes and, manholes comprises a plate seated-against the inner 'face of the boiler heador body and having connected thereto a bolt. which extends out through a yoke or arch piece seated a ainst the outer face of the boilerhead or bo y and a nut screws onto the outer end of the bolt and bears against the yoke or arch piece, and draws the plate to a steam tight joint against a rubber, lead or other gasket on the inner face of the ware head or body. pressure of the steam therein Iforces the amount of slack between the nut and the yoke. When the pressure drops this slackv the plate to move away from the gasket and as'the' latter becomes permanently compressed "and loses its elasticity,

leakage occurs. i To prevent this it has been found necessary to tighten the nuts up before the boiler cools down' so as to take up the slack betweenthe nut and.yoke caused by. the compression of the gasket.

This necessitates much. additional labor on" the part of;

the engineer and is often neglected fand if' it is not carefully watched the leakagegives,

trouble. I v.

The resent invention is intended to overlie above diflicu'lty'and to do away with the necessity of tightening up thenuts' on the handhole bolts'as above described.

It consists, generally, stated, in combination with the boiler having .a manhole or handhole, a plate closing the same and seated against the inner face of the, boiler, and

, spring controlled means forholding the plate,

to its seat, such asfby the inter osition of 'a s ring betweenthe' yoke or arc pieceend t 1e nut engaging the bolt. I

' Inthe accpm'p'anymg drawings, Figure 1 is a sectional view illustrating the end of, a

s am-ion of Letters Patent. Application filed November-3, 1906. Serial No. 341,987.

Patented May 14, 1907.

watergtube boiler employing the invention;

Fig. 2 is 'a-perspe'ctive of part of the boiler head; Fig. 3 is a section through the-handhole and plate; Fig. 4 is a view illustrating the invention applied to the manhole at the end of an ordinary boiler, or like drum.

The boiler to which the invention-may beapplied may be of any construction, that s own inthe drawing bein simply illustrative. In the illustration oi the tubular or water tube boiler, the boiler-head is shown at 1 having the handhole openings 2 with these plates being-inserted through the handholes which are out of true circular shape and in such construction. The-handhole'plate 3 has the flange 4 which engageswith the ordinaryrubber, lead or other gasket-5 seated on the so permit their insertion as 181181181 inner has the bolt '6 secured thereto in anysuitable way. which extends outwardly through the yoke or arch piece, the outer end of same be- .ing threadedto receive the nut 8'. Interposed When the boiler is in use the}.

Any suitable spring may ,be em loyed for this purpose, that which I have ilustrated being a spiral s ring. The

device so shown is illustrative o the eneral R which the ordinary'handhole plates 3 engage,

between the nut 8 and the arch piece 7.is a" I [strong spring 9. andhole plate against the gasket, thus compressing the latter and producing a certain principle of the invention which inclu es any. spring controlled means for holding and seating the handhole late against the inner face of the boiler head or wall. The interposed spiral sprin for this purpose is believed to be as simp e and effective a device as is known. The s ring is of suiiicient strength to hold the ham hole plate 3 to its seat and takeup any slack which might com ression of the' gasket 5. \Vhen the ban holeplate'is applied the nut 8 is screwed down firm becomesjc ompressed, the spring-9 expands occur by reason of the thus putting the spring-*9 under compression. Consequently, when the press-x sure.ir 1- .theboiler forces the handholefplate- 3 tightly against the gasket-5 and the latter and"thus autonm c y ta p a y Slack cause. "Consequently, when "the boiler cools between the nutand thefyoke due to this.

1 5 .down' and. the pressure drops, this spring I holdsthe plate tightly against the gasket,

thus actingautomaticall to providea steam v tight joi "t betweenthe p ate 3 and the gasket-f 5 at all'ftimes and overcoming any tendencytoleakend'also dlspens'mg with the necessity ofti'ghtening up the nuts as heretoioreof f face of the boiler head. The plate 3 ago The invention as il the same in drum. In said figure the inturned flan '14 h rdinary'b'oilei' ge 1- 3-and'the manhol ng'e 15 fittin turned flange of the dr vket16 is confined between and said flange. manhole plate and or arch piece 18 and throu and is secured by the nut 2 vantages are realized in th that. described in'connecti late illustrated iIi'th at I claim is:

1. In combination with having a manhole orhan against the inner face 0 body, and spring contr ing the plate to its seat.

2. In OOmbIDSLtZlOII with a boiler or drum against the inner face of the boi cr or drurii I dhole, a plate clos body, and spring controlled means for hold- 55' of the ing the plate to its seat, constructed and a-yoke or arh piece en'- adapted to o e'rateinde endentlyof the elase of'the boiler body, a ticity of the andholeplb he plate and extending In testimony whereof, I the said JUNIUS' ecepargd a compression A. MCCORMICK have hereunto set m hand. 6

tweemt ev The bolt 17 v passesthrou g a manhole or'lian ing orseated against boiler or drum body, ga ing thelouterfac b0 through the spring confined be nuittholdingthe bol j In combination with' having amanho1eor' ban he inner face lustrated in Big. 4 is ingor seated. against the inner face of the being simply applied boiler body, a yoke or arch piece engaging or like the outer face of the boiler ordrum bod a 35 the drum headl2'has =bolt connected to the 'plate and extending e plate through the arch piece, and a spiral spring inst the insurrounding the bolt and confined between asthe yoke and the nut securing it in place. anhole p atev 4. The combination with a ri id-manholc 40 engages the or handhole plate, and a rigid arc oryoke of gh the yoke spring controlled means for drawing the mangh the spring 19 hole plate toward the arch. 0. The same-ad 5. The combination with an inelastic manis construction as hole or handhole *plate' having a compressi- 5 on with the handble gasket arranged at the edge of the plate, e other figures.

of a rigid-arch, a bolt passing througi the arch and movable therein, said bolt being a boil-eror connected to said pla'te, a nut carried by said,

dhole, a plate seated bolt and a spring interposed between the said 50 f the boiler 'or drum nut and the said arch. lled rneans for hold- 6. In ombination'with'a boiler or drum having a inanholeor handhole, a late seated yoke and JUNIUS A. McCORM cK.

Witnesses:

:aqboiler .or ROBERT C. Tom-ran,

clos-' "JQR. Katrina. 

